Electrochemical Corrosion


  1. The rusting of iron can be made faster if the iron is in contact with a metal that is less electropositive than it. Corrosion of metals such as this is known as electrochemical corrosion.
  2. Electrochemical corrosion is a process where a metal corrodes through losing of electrons (oxidation) to form cations in the presence of an electrolyte when the metal is in contact with another metal that is less electropositive than it.
  3. The rusting of iron is made slower if the iron is in contact with a metal that is more electropositive than it.
  4. The higher the difference of the electropositivity between the two metals, the faster the corrosion of the metals that occurs on the metal which is more electropositive.
  5. For example, iron rusts more easily when it pairs with copper metal than when it pairs with tin. On the other hand, iron is less likely to rust when it pairs with magnesium than when it pairs with zinc.


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